Thanks for the input guys.....keep the comments coming.
My pulley had surface rust on all unprotected surfaces but the plating was preserved on the inner and outer surface where it was in contact with the water pump hub and the fan spacer. I can't tell of it was ever painted but I didnt find any trace of black paint.
I have a couple other pulleys that have plating under the black paint. Either silver cad or bright zinc....not sure how to tell the difference between the two but the plating is shiny.
Never seen a gold cad or dichromate zinc pulley except on some restored cars. Here is a photo of Jim's Deuce Bird.
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